Figure 2

Mytilus edulis specific allele and haplotype frequencies plotted against geographical distance of the transect across the Baltic. (a) Frequencies of the M. edulis specific alleles of three nuclear markers (ITS, M7 lysin and EFbis). (b) Frequencies of the maternally transmitted M. edulis F genome (F_E-mitotype) and the paternally transmitted M. edulis M genome (M_E-mitotype). The M_E-mitotype frequency equals the frequency of M_E/F_E heteroplasmic males as shown in Table 2. North American allopatric populations of M. trossulus are fixed for the T allele at all loci.